Every feature below is anchored to a real data point from a 13-week mesocycle run on Calyber. 1,068 sets, 26 exercises, 34 algorithmic adjustments, all traceable.
Programs are configured per mesocycle: weeks, days per week, muscle priorities, and the RIR progression schedule. The builder generates a full week-by-week structure with planned exercises, set counts, rep ranges, and target RIR per session.
Methodology →Reference Data
From Upper Body - 2026.
Logging is the input layer for everything downstream. Weight, reps, completion state, and exercise notes are recorded per set. Auto-progression suggests the next session's weight and rep targets based on prior performance.
e1RM formula →Reference Data
From Upper Body - 2026. Every set is the input the algorithm reasons from.
After every session, the algorithm reads soreness, pump, workload, and performance signals and adjusts the next week's volume target per muscle group. Increments, decrements, holds: each is a documented response to a documented input.
AUTOREGULATION EVENT LOG · 34 EVENTS
Algorithm interventions across 13 weeks of Upper Body - 2026
The Muscle Group Fatigue Index is a composite of soreness, pump, workload, and performance signals, split into a Readiness Index (RI, short-window) and an Accumulation Index (AI, decayed multi-session burden). The fatigue map renders per-muscle state so you can see which groups are fresh, building, elevated, or critical before stepping under the bar.
Fatigue Index reference →Reference Data
See /algorithm/fatigue-index for the full formula.
Triggered deload weeks based on MGFI thresholds. Per-exercise adjustments when a single movement spikes fatigue. Half-week and whole-session recovery commands when subjective inputs exceed sustainable ranges. The recovery system runs alongside the prescription engine, not as a manual override.
Methodology →Reference Data
Deload is a load reduction, not a rest week. Volume drops; movement continues.
Block-level analytics for every completed mesocycle: e1RM trajectory per lift, weekly volume vs MEV / MAV / MRV landmarks, autoregulation event log, fatigue arc. The mesocycle is the clinical trial; analytics is the result.
E1RM TRAJECTORY · BENCH PRESS
Upper Body - 2026 · 11 weeks · Δ +32%
Baseline W3: 95 lbs · Peak W12: 125 lbs · Δ +32%
28-day free trial · No card required
Trial starts when you build your first mesocycle
Founding $19/mo locked · Standard $29See plans →